Only when people are idiots. 
Lightning grenades are good, don't get me wrong, but they don't 1 shot - they bring people low, and if those people don't move it will kill.
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	Bruh. Bruh just stop. Bruh. Stop bruh.
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	Honestly, I'd put long burning firebolts, changing arc bolts, and tripmines above lightning grenades too. And in some situations, suppressor grenades. But fusion grenades that heal probably trump them all.